Research On Modeling Simulation And Control Strategy Of Hybrid Electric Vehicle Based On CRUISE

With the rapid development of the world economy,the excessive consumption of oil has led to such global problems as energy shortage and greenhouse effect.In view of the continuous increase of car ownership and increasingly strict emission standards,the research and development of hybrid and other new energy vehicles has gradually become a new research direction.Hybrid electric vehicle has been widely used because of its good performance and fuel economy,and its ability to realize multiple power source coupling.Among the key technologies of hybrid power,vehicle modeling,simulation and design control strategy are the basis of academic research.Based on the design of hybrid power system,the research on parameter design,vehicle model construction and control strategy is carried out in this paper.Firstly,according to the research results of hybrid electric vehicle,the key technologies of hybrid electric vehicle system at home and abroad are analyzed.Secondly,the structure,coupling mode and mixing degree of hybrid power system are studied as the theoretical basis of this paper.Then,select the basic technical parameters of a domestic hybrid electric vehicle as a reference,design a hybrid system,the main feature is to set the clutch at the end of the engine and drive motor.According to the characteristics of the vehicle,the dynamic performance and economic indicators are formulated,and the selection of power system components and the calculation of relevant technical parameters are completed.On this basis,AVL CRUISE simulation software is used to build the vehicle model,including the power source component model and the power battery model.In MATLAB/SIMULINK environment,the design is out of accord with mixed type hybrid control strategy,this article choose motor auxiliary energy control strategy,including demand torque calculation and operation mode switching and power distribution module,and the AVL CRUISE software set in the typical NEDC driving cycles,build automobile power performance and fuel economy calculation task,completed the AVL CRUISE and MATLAB simulation.According to the analysis of simulation data and curves,it is shown that the system parameters of the design scheme meet the initial set requirements of dynamic performance and economic efficiency,and the control strategy can realize the power distribution of the designed vehicle.In addition,when the vehicle runs in pure electric mode at a speed of 40km/h,the power battery maintains a stable state and the driving range can reach 27.1km.Finally,multi-island genetic algorithm was selected in the iSIGHT optimization software to optimize the transmission gear ratio and the main reducer ratio.By comparing the simulation results,it is shown that the optimized scheme reduces the fuel consumption by 12.9% and improves the overall performance of the designed vehicle.